The only dual-display TDS controller on the market from HM Digital Inc., of Los Angeles, monitors feed and product water lines of high-output RO systems simultaneously. With this unique product, technicians can easily control and monitor a filtration system as well as set automatic alarms on both lines for precision accuracy. The PS 202 Dual Display TDS Controller comes factory-calibrated, equipped with two full-length ½-inch probes, and is compatible with both 110V or 220V.